/in/foo.cc: In function 'int main()':
/in/foo.cc:38:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<v.size()&&v[j]<=x;j++)
               ~^~~~~~~~~
/in/foo.cc:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<v.size();j++)
                ~^~~~~~~~~